InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,535,874
Ozluturk , et al. May 19, 2009

--------------------------------------------------------------------------------
Method and apparatus for adaptive power control for spread-spectrum communications


Abstract
A code division multiple access subscriber unit comprises an antenna configured to output a radio frequency signal, the radio frequency signal having a quadrature (Q) channel and an in-phase (I) channel. A circuit coupled to the antenna, the circuit being configured to generate power control bits which are carried by one of the I and Q channels and not the other one of the I and Q channels, the power control bits are spread coded and are adapted to control an output power of a base station. The radio frequency signal is a first radio frequency signal, the circuit is further configured to generate the power control bits based on a power level of a second radio frequency signal output by a base station and an interference level associated with the second radio frequency signal.


--------------------------------------------------------------------------------
Inventors: Ozluturk; Fatih (Port Washington, NY), Lomp; Gary R. (Centerport, NY), Kowalski; John (Hempstead, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DC)

Appl. No.: 10/988,410
Filed: November 12, 2004

--------------------------------------------------------------------------------

Related U.S. Patent Documents

--------------------------------------------------------------------------------

Application Number Filing Date Patent Number Issue Date
09795540 Feb., 2001 7123600
08956740 Apr., 2001 6215778
08669775 Aug., 1998 5799010
09721034 Dec., 2002 6493563
09003104 Jan., 2001 6181949
08670162 Nov., 1998 5841768
09304286 Jun., 2001 6252866
08671068 Aug., 1999 5940382
09354042 Aug., 2003 6608825
08671067 Sep., 1999 5953346
08670160 Nov., 2002 6487190
09079600 Jun., 2002 6405272
08671221 May., 1998 5754803
60000775 Jun., 1995


--------------------------------------------------------------------------------

Current U.S. Class: 370/335 ; 370/320; 370/342; 370/441
Current International Class: H04B 7/216 (20060101)
Field of Search: 370/335,320,442,441,247,264,276,277,304,322,324,326,328,329,341,350,395.62,431,464,479,503,507,509-514,100.1,103,105.4,105.5,106,508,105.2,110.1,522,282,519,524,206,208,209,318,342 455/403,407,39,500,42,524,526,60-62,56.1,309,312,298,205,127.1